mk/genlink-config: provide LIBNAME in devices autogeneration

This makes the generic rules workk happily regardless of whether the
linkerscript generation is being used or not.

Notably, in the examples repo, use of the linker script autogeneration
was retriggering library builds as LIBNAME was unset and therefore the
libraries lib<blank>.a couldn't be found.

mk/genlink-config.mk

@@ -55,17 +55,18 @@ endif
 # only append to LDFLAGS if the library file exists to not break builds
 # where those are provided by different means
 ifneq (,$(wildcard $(OPENCM3_DIR)/lib/libopencm3_$(genlink_family).a))
-LDLIBS += -lopencm3_$(genlink_family)
-LIBDEPS += $(OPENCM3_DIR)/lib/libopencm3_$(genlink_family).a
+LIBNAME = opencm3_$(genlink_family)
 else
 ifneq (,$(wildcard $(OPENCM3_DIR)/lib/libopencm3_$(genlink_subfamily).a))
-LDLIBS += -lopencm3_$(genlink_subfamily)
-LIBDEPS += $(OPENCM3_DIR)/lib/libopencm3_$(genlink_subfamily).a
+LIBNAME = opencm3_$(genlink_subfamily)
 else
 $(warning $(OPENCM3_DIR)/lib/libopencm3_$(genlink_family).a library variant for the selected device does not exist.)
 endif
 endif
 
+LDLIBS += -l$(LIBNAME)
+LIBDEPS += $(OPENCM3_DIR)/lib/lib$(LIBNAME)
+
 # only append to LDLIBS if the directory exists
 ifneq (,$(wildcard $(OPENCM3_DIR)/lib))
 LDFLAGS += -L$(OPENCM3_DIR)/lib